LUFSBar sits in the menu bar and shows the loudness of whatever is currently playing on the Mac - a streaming service, a browser, a DAW - using Core Audio process taps. No BlackHole, no Loopback, no virtual audio device.

Momentary, short-term or integrated LUFS in the bar itself, with the full readout including True Peak one click away. A reference snapshot captures the loudness of whatever is playing, so a mix can be compared against a reference track in real time. A streaming forecast shows how far the current material sits from Apple Music (-16), Spotify (-14) and YouTube (-14).

Measurement uses libebur128 for ITU-R BS.1770-4 / EBU R128 compliance: K-weighting, gating, and 4x oversampled True Peak.

No network requests, no telemetry, no account. Audio is analysed in memory and never written to disk. MIT licensed, with the source on GitHub.

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